TY - JOUR
T1 - Origin of Phobos and Deimos by the impact of a Vesta-to-Ceres sized body with Mars
JF - Science Advances
JO - Sci Adv
DO - 10.1126/sciadv.aar6887
VL - 4
IS - 4
SP - eaar6887
AU - Canup, Robin
AU - Salmon, Julien
Y1 - 2018/04/01
UR - http://advances.sciencemag.org/content/4/4/eaar6887.abstract
N2 - It has been proposed that Mars’ moons formed from a disk produced by a large impact with the planet. However, whether such an event could produce tiny Phobos and Deimos remains unclear. Using a hybrid N-body model of moon accumulation that includes a full treatment of moon-moon dynamical interactions, we first identify new constraints on the disk properties needed to produce Phobos and Deimos. We then simulate the impact formation of disks using smoothed particle hydrodynamics, including a novel approach that resolves the impact ejecta with order-of-magnitude finer mass resolution than existing methods. We find that forming Phobos-Deimos requires an oblique impact by a Vesta-to-Ceres sized object with ~10−3 times Mars’ mass, a much less massive impactor than previously considered.
ER -